syzbot


BUG: unable to handle kernel NULL pointer dereference in __lookup_slow

Status: fixed on 2021/03/10 01:48
Subsystems: reiserfs
[Documentation on labels]
Reported-by: syzbot+3db80bbf66b88d68af9d@syzkaller.appspotmail.com
Fix commit: d24396c5290b reiserfs: add check for an invalid ih_entry_count
First crash: 1357d, last: 1215d
Cause bisection: the issue happens on the oldest tested release (bisect log)
Crash: WARNING in sysfs_warn_dup (log)
Repro: C syz .config
  
Fix bisection: fixed by (bisect log) :
commit d24396c5290ba8ab04ba505176874c4e04a2d53c
Author: Rustam Kovhaev <rkovhaev@gmail.com>
Date: Sun Nov 1 14:09:58 2020 +0000

  reiserfs: add check for an invalid ih_entry_count

  
Discussions (1)
Title Replies (including bot) Last reply
BUG: unable to handle kernel NULL pointer dereference in __lookup_slow 1 (4) 2021/01/11 11:14
Similar bugs (4)
Kernel Title Repro Cause bisect Fix bisect Count Last Reported Patched Status
linux-4.19 BUG: unable to handle kernel NULL pointer dereference in __lookup_slow (2) C done 15 1037d 1161d 1/1 fixed on 2021/09/13 16:54
upstream BUG: unable to handle kernel NULL pointer dereference in __lookup_slow (2) reiserfs C inconclusive 4 1075d 1159d 0/27 auto-obsoleted due to no activity on 2023/04/14 10:28
linux-4.19 BUG: unable to handle kernel NULL pointer dereference in __lookup_slow C done 23 1194d 1352d 1/1 fixed on 2021/04/10 11:48
upstream BUG: unable to handle kernel NULL pointer dereference in __lookup_slow (3) overlayfs C inconclusive 21 2d12h 48d 0/27 upstream: reported C repro on 2024/04/28 08:01

Sample crash report:
REISERFS (device loop0): journal params: device loop0, size 8192, journal first block 18, max trans len 256, max batch 225, max commit age 30, max trans age 30
REISERFS (device loop0): checking transaction log (loop0)
REISERFS (device loop0): Using rupasov hash to sort names
REISERFS (device loop0): using 3.5.x disk format
BUG: kernel NULL pointer dereference, address: 0000000000000000
#PF: supervisor instruction fetch in kernel mode
#PF: error_code(0x0010) - not-present page
PGD 1d5b1067 P4D 1d5b1067 PUD 13a4d067 PMD 0 
Oops: 0010 [#1] PREEMPT SMP KASAN
CPU: 0 PID: 8464 Comm: syz-executor889 Not tainted 5.10.0-rc7-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
RIP: 0010:0x0
Code: Unable to access opcode bytes at RIP 0xffffffffffffffd6.
RSP: 0018:ffffc900015ffa10 EFLAGS: 00010246
RAX: 1ffffffff13857c8 RBX: dffffc0000000000 RCX: ffff8880152c8000
RDX: 0000000000000000 RSI: ffff88802e27dbe8 RDI: ffff888034c90190
RBP: ffffffff89c2be40 R08: ffffffff81c397ee R09: fffffbfff1eabc57
R10: fffffbfff1eabc57 R11: 0000000000000000 R12: 0000000000000000
R13: ffff888034c90190 R14: 1ffff11005c4fb7d R15: ffff88802e27dbe8
FS:  00000000023f0880(0000) GS:ffff8880b9c00000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: ffffffffffffffd6 CR3: 0000000012d42000 CR4: 00000000001506f0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
 __lookup_slow+0x240/0x370 fs/namei.c:1544
 lookup_one_len+0x10e/0x200 fs/namei.c:2563
 reiserfs_lookup_privroot+0x85/0x1e0 fs/reiserfs/xattr.c:979
 reiserfs_fill_super+0x2a57/0x3140 fs/reiserfs/super.c:2176
 mount_bdev+0x24f/0x360 fs/super.c:1419
 legacy_get_tree+0xea/0x180 fs/fs_context.c:592
 vfs_get_tree+0x88/0x270 fs/super.c:1549
 do_new_mount fs/namespace.c:2875 [inline]
 path_mount+0x17b4/0x2a20 fs/namespace.c:3205
 do_mount fs/namespace.c:3218 [inline]
 __do_sys_mount fs/namespace.c:3426 [inline]
 __se_sys_mount+0x28c/0x320 fs/namespace.c:3403
 do_syscall_64+0x2d/0x70 arch/x86/entry/common.c:46
 entry_SYSCALL_64_after_hwframe+0x44/0xa9
RIP: 0033:0x44707a
Code: b8 08 00 00 00 0f 05 48 3d 01 f0 ff ff 0f 83 fd ad fb ff c3 66 2e 0f 1f 84 00 00 00 00 00 66 90 49 89 ca b8 a5 00 00 00 0f 05 <48> 3d 01 f0 ff ff 0f 83 da ad fb ff c3 66 0f 1f 84 00 00 00 00 00
RSP: 002b:00007ffc217e9828 EFLAGS: 00000297 ORIG_RAX: 00000000000000a5
RAX: ffffffffffffffda RBX: 00007ffc217e9880 RCX: 000000000044707a
RDX: 0000000020000000 RSI: 0000000020000100 RDI: 00007ffc217e9840
RBP: 00007ffc217e9840 R08: 00007ffc217e9880 R09: 00007ffc00000015
R10: 0000000000000000 R11: 0000000000000297 R12: 0000000000000006
R13: 0000000000000004 R14: 0000000000000003 R15: 0000000000000003
Modules linked in:
CR2: 0000000000000000
---[ end trace f20ed6d33f177882 ]---
RIP: 0010:0x0
Code: Unable to access opcode bytes at RIP 0xffffffffffffffd6.
RSP: 0018:ffffc900015ffa10 EFLAGS: 00010246
RAX: 1ffffffff13857c8 RBX: dffffc0000000000 RCX: ffff8880152c8000
RDX: 0000000000000000 RSI: ffff88802e27dbe8 RDI: ffff888034c90190
RBP: ffffffff89c2be40 R08: ffffffff81c397ee R09: fffffbfff1eabc57
R10: fffffbfff1eabc57 R11: 0000000000000000 R12: 0000000000000000
R13: ffff888034c90190 R14: 1ffff11005c4fb7d R15: ffff88802e27dbe8
FS:  00000000023f0880(0000) GS:ffff8880b9c00000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: ffffffffffffffd6 CR3: 0000000012d42000 CR4: 00000000001506f0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400

Crashes (3):
Time Kernel Commit Syzkaller Config Log Report Syz repro C repro VM info Assets (help?) Manager Title
2020/12/10 04:33 upstream a68a0262abda c090b4da .config console log report syz C ci-upstream-kasan-gce-smack-root
2021/02/15 16:12 upstream f40ddce88593 98682e5e .config console log report info ci-upstream-kasan-gce-selinux-root BUG: unable to handle kernel NULL pointer dereference in __lookup_slow
2020/09/26 18:15 upstream 7c7ec3226f5f 2d5ea0cb .config console log report info ci-upstream-kasan-gce-selinux-root
* Struck through repros no longer work on HEAD.